Francois vast ryssjslberghe



(No Model.)

F. VAN RYSSELBERGHE. MEANS POE'PREVENTING INDUCTON IN TELEPHUNB AND TELEGBAPH LINBS.

No. 321.404.. Patented'June 30 1885.

v UNITED STnTns rnnjors VAN RYSSELBERGHE, OF so AnRBnnK, numurin.

MEANS FOR PREVENTI NG NDUCTION lN TELEPHONEAND TELGRAPH LENES.

SPECIFICATION forming part of Letters Patent No. 321304, dz ted June 30, 1885.

,Application filed April 29, 1889. I (No model.) :Patentrl in Belgium February 20, 15851, Ne. 57,121 in ?inne-c February 26. 1582, Ne.

147.515; in England March 17, 1882, N0.l,303; in Italy March 29. 1882; in Germany June 17. 1882. Ne. :1,451 in AnstriJuly H,

1882; in Canada August 17, 1882, No. 15,333 in Luxcmhurg December 8, IESB; in Portugal Jmu v 18, lrl; in India January %ll 1884; in Sweden February 12, 1884; in Spain April w. 1884; in Denmark June 18, 1834; in Brazil July 5 1884; in Arg'cie Re pnhlic uly 19, 1881, and in Uruguay December !23, 1884.

To &ZE whom, 'z may concern Beit known that I, FRANOIS VAN RYSSEL- BERGHE, a subject of the King of the Belgians, residing at Schucrbeek, in the Kingdom oi'Belginn, have invented e new andnseful Improvement in the Method of and Appuratusfor Preventing Indnction in Telegraphic and Telephonic Systems, of whichthe following is u specificotion.

.The same invention has been putented to me in Belgium February 20, 1882, No. 57,121; France, February 26, 1882, Jo. 1 173515; Great Britninillnrch 17,1882,N0. 1,303; Itnly,March' 29, 1882; Germany, June 17,1882,No.21,451; Austria, July 9,1882; Genadu,Ai1gustl7,1882,

No. 15,333; Luxenhurg, December 8, 1883;` TortugaLJ-anuury 18, 1884; Indie, J anuary 29,

188 1; Swcdcn,Februury12,1884; Spain,April 23, 1884; Denmark, June 18, 1884; BreziLJuly 5, 1884; Argentine Republic, July 19, 1884:, and Uruguay, December 12, 1884.

My invention relates to combined telegraphic und tel ephonie systems in which the wires used for telegrophy and those used for telephony are urra ng ed within inductivedistance of each other, the object of my improvement being to prevent the strong elcctriccurrents used in telegraphy from inducing upon the telephonewires indueed Currents of a character to interi'ere with telephonic communication.

It is well known that when telegraph and telephone wires ure supported on the same polcs or posts, are in the some cuble, cross euch other, or ure otherwise in inductive rclution to euch other, it has hitherto been extremely difficult and often inpossibleto use the telcplonewvires for their intended purposo, the ditiicnlty arising froni the fact thot the strong tclegruphic Currents inducc upon the tclr' phone-wires currents which operute the telcphonic receiving-instruneuts indepcnd ently oftle telephonecurrents,(which ure 00111- pnratively Very fceble,`) and cause such instruncnls to emit harh, rattling sounds, which mix with, confuse, and frequently rendor indistinguishuhle the tclcphonic communications. i v

My invention is based upon my discovery that Currents induced bytelcgraphy upon telephone-wires ure hurt'l'ul to tclephony in proportion to their ahruptness-the more ahrnpt the more hurtful. Induced currents corre spond in abruptncss to the primury Currents which cause them, and, therel'o'c, in combined systensonly 'gradual currents should be used in telegraphic tronsmission thut is to say, currents which during their cnission increase gradually and during their extinction dininish gradually in strcngth-end when such grad nal' primary telegruphic Currents ure usedl have found that the resulting induced Currents on tclephoneswill, in passing through tele phonic receivers, cause. the diuphrugns or sound-producing` Vihrutors ot' such r'cceivers to simply inflectwithout vibruting in u. inanner to prodnce sound.

In order to praeticnlly utilize ny discovery I enploy, in connection with the' tclegruphic trunsmitting instrunents, certain devices which I call *fcurrentgraduntors, or I so construct the trensmitting instruneuts that they will, when nunipulzited, throw upon the line impulses which 'increase and decrease gradually in strength. ing devices muy he ol' various forms, some of which ure illustruted in the accompzinying druwings, froni which and the following purticulur description and cxpiunulion the invcntion muy be tully understood.

Fgnre 1 is u diugrnn illnstrut'ng the use of u condcnser as a current-gruduutor in connection with u trunsmitting-kcy in a telegruph` eircuit of u mixed telcgraph and telephone system. showing electro [nugnets used as current-graduators. Fig. i is another diagrum showing u transinitting kcy constructed to gruduutc theinpnlses it sends.

Referring to Fig. 1, the letter b indicates a conventionul reprcscntution of e telephone linc-wire, including u telephonic receiver, c, und ur'ungcd adjacent tou telegraphline-wire, which is indicutcd hy a The telegmph-wire is connected in the usunl manner to u transnitting-kcy, d, one of the Contacts or nnvil of The current-gruduat;

The letter e indicates arelay connectedwitl' the other contact of the key in the ordinary 4 manner,and arranged to make and break the tween the line and'the'relay c.

circut of a local battery, Z, which includes' a sounder, s, or other telegraphic receiving-instrument.

- and as the charging is gradual the full force of the battery-eurrent is not felt immediately upon the line, but reaches its maximum only when the condenser is fully-charged. When the key rises and the battery is disconnected,

4 the condenser' begins immediately todischarge upon the line, and as its discharge rapidly weakens a gradual fall of potential occurs in the line, instead of an abrupt breakfl'the effect of induction upon the telephone-line being harmless, as hereinbefore pointed out. I have found that a condenser of ten microfarads Capacity will ordinarily be sufficient.

In Fig, 2 the eurrent-regulator is lettcre'd g', and i this case is an'elcctro-magnet. It has one coil-terminal connected to the anvil of the key and the other to one pole of the main battery f. the other pole of which is to grouud. The other parts are arranged as in Fig.- 1. An electro-magnet having a core fitteen nill'imetcrs in diameter 'and fifty milli- VITIGGI'S in length, and of which the resistance is one hundred ohms, is suitable to serve as a current-graduator. -In the first moment 'after depression of the key a portion of the current, is absorbed inmagnetizing the core ofthe magnet, and consequently the flow into line is by so much the less, and the full flow is not experienced until this nagnetization is complete. On the other hand, when the key cuts out the battery the core, in losing its 'magnetism, ses up a current in its coils which, passing into the line-wire, prevents the fall of potential being'so rapid as it otherwise would be.

Fig. 3 shows a like arrangement to Fig. 2,

' but the electro-magnet serving as the currentgraduator di'erently placed. It is indicated by g, and in this case serves also the usual function ot' the electro-nagnet in a relay. .The relay, however, is connected differently from theusual way, having one coil-terminal dihaving a low condncivity. Itis at one end I connected with 'the main lrattery, and through 4 it to ground. On its other end, but insula'tcd therct'rom by a thin plate, 72, of non-conducting material, is monnted a curvedfmetall'ic sp-ing,=;1:, -curving away from the plate h, and:

hearing against a metallic stop, 't,- which'is connected to ground.. The other end of the spring is connected to one terminal arthe ordinary relay, e, which has its otherftcrniinal connected toline.

nects the line to ground. XVhen it is depressed,

it will come in contact with plate h, first near its fixed end,'and gradually through nearly its whole length. At first the battery-current is resisted by ncarly the whole length of pl ate h.

'As the depression of the kcy continues the.

lent thereof, for causing the impulscs thrown on the line by said transnitters to increase and decrease gradnally in strength, essent ially as set forth.

2. The conibination, with a tclephonic linewire, of an inductively-adjacent' telegraplwire cquipped with make -`aidbreak .telegraphic transn'itters and a condenser or its equivalent, as described, for causing the telographic inpulses to increase in strength gradually from a make and diminish in strength gradually from a break, for the purpose setforth. y

3.' The combination, with a telegraphic linewire equipped with make-and-break transnitters and arranged inductively adjacent to a telephonewire, of eurrent-graduating devices, such as a condenser or its equivalent, arranged to cause the telegraphic impulses to increase in strength gradually from makes and-to diminish gradually frofn' breaks, for the purpose set forth.

4. The combination, with a tclegraph linewire, a normally-open key connected therewith, and a main battery connected with the -circuit-closing contact of the key, of a condenser or its equivalent included in a derivation from the line, substantially as and for the purpose :set forth FRANOIS VAN RYSSELBERGHE.

XVi tnesses:

C. PRAU. F. i CLEIRENs.

The spring serves asafin- 'ger-key. \Vlen*it is against the stop t, it cone IIO 

